Justin King, the former chief executive of British supermarket group Sainsbury's, is to re-join Marks & Spencer as a non-executive director, the clothing and food retailer said on Tuesday.
King led Sainsbury's revival before stepping down in 2014. He is also a former head of food at M&S and has previously worked for Asda.
He will take up his new role at M&S on 1 January.
"Justin is recognised as one of the UK's most successful retail leaders," said M&S.
When he quit Sainsbury's, King said he wanted another big job. However, that did not materialise.
King has been vice-chairman of private equity firm Terra Firma since 2015, although it was reported by Sky News earlier this month that he was stepping back from day-to-day management of the buyout group.
Shares in M&S were up 0.4% at 11.37 GMT.
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